Beyma 4FR40
8Ω
Full-range
Nominal diameter | 4″ / 100 mm |
Resonance | 92 Hz |
Q factor | 0.89 |
Sensitivity | 86.1 dB |
Linear excursion | ± 3 mm |
Program Power | 80 W |
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- Sensitivity (1W, 1m, infinite baffle) SPL1W 86.1dB
- Frequency response 100 - 20000Hz
Thiele & Small parameters
- Resonance frequency (free air) fS 92Hz
- Mechanical quality factor QMS 11.30
- Electrical quality factor QES 0.96
- Total quality factor QTS 0.89
Large signal parameters
- Maximum linear excursion xmax 3mm
- Air volume displaced at xmax VD 17cm³
- Power handling P 40W
- Program power Pmax 80W
Voice Coil
- Nominal impedance Z 8Ω
- DC resistance RE 6.4Ω
- Inductance (1kHz) LE 0.2mH
- VC Diameter 20.3mm
- Winding height HVC 7.7mm
Magnet
- Force factor Bl 4.2N/A
- Motor constant Bl/√RE 1.66N/√W
- Air gap height HAG 5mm
Diaphragm
- Effective diameter 84mm
- Effective area SD 55cm²
- Moving mass MMS 4.4g
- Moving mass (without air load) MMD 4.1g
Suspensions
- Stiffness KMS 1.5N/mm
- Compliance CMS 668µm/N
- Equivalent volume to the compliance VAS 2.8L
- Mechanical resistance RMS 0.23N·s/m
Dimensions
- Nominal diameter 4″
- 100mm
- Overall diameter 118mm
- Baffle cutout diameter 92mm
- Overall depth 60mm
- Volume occupied by the driver (estimated) 0.17L
- Net weight 0.55kg
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